Improvement in jewelers  combined calipers and poising-tools



intrd tat-ra FRANCIS E. ALLEN, 0F KEENE, NEW HAMPSHIRE.

Letters Patent No. 112,203, dated February 28, 1871.

IMPROVEMENT IN JEWELERS COMBINED CALIPERS AND POlSlNG-TOOALS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern.-

Beit known that I, 'FRANCIS E. ALLEN, of Keene, in the county of Cheshire and State of New Hampshire, have invented certain new and useful Improvements in Jewelers Combined Calipers and Poisiug- Tool; and I dovhereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon, which form a part of this specification, in which- Figure l is au end view of my invention Figure 2 is a side View; and

Figure 3 is an inside view of one of the jaws of the calipers. l

The nature of my invention consists in constructing a combined calipers and poising-tool, in the manner hereinafter' fully set forth. v

In the annexed drawing- A represents the base of the tool.

To the circular top of base A the calipers b are securely fastened, the said calipers heilig made to terminate in the parallel jaws c c.

On the inner side and on top of each jaw there are ndcutations so arranged as to be exactly opposite when the jaws c c are in position. v

e designates a spindle or arbor passing horizontally I through the calipers, and having a screw-thread ou one end, upon which the nut (l is adjusted. r

g represents a curved arm, made of a thin plate of metal, and having a socket at its lower end through which the spindle e passes. The arm g fits tightly ou the spindle and moves with it.

In ascertaining whether a. wheel is perfectly true on t its arbor, or whether the arbor itself is true, place the pivots at the ends of said arbor in or on the two corresponding depressiousin the jaws ofthe calipers, and then turn the curved arm g up to the side of the wheel. By turning the wheel around, Ayou will be enabled to ascertain whether the wheel or arbor is true.

Having -thus fully described my invention,

What I claim, and desire to secure by Letters Patent, is

The jaws cc, provided with indent-ations, and combined with spindle e and arm g, substantially as aud for the purpose set forth.

In testimony that I claim the foregoing as my own I aix my signature in presence of two Witnesses.

' FRANCIS E. ALLEN.

Witnesses L. E. THURsToN,

J. S. BOLT. 

